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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f521f5b95e9bf89e9f9dc6c23e0d601800953880b4f2722c58e87e7c18118d' 
  AND token = 'Ubp3a+6H8ZHIVWIrdoi+9VauAbY3u0xakNjxWQBJ4f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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