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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b263dc6301efef6a0b3f5cb8c4c3ebd70180bf5c55f9e01473d716714df26dd' 
  AND token = 'Np4jeIY1G4HzSED6Yyo/04ohD5FT1zuBpKC4//51Oj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}