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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a52d08e33f88f718bd8fa74a12e9f5c1f96ec6a17b09dbfd4d294f9a2370dc' 
  AND token = 'eQ8i1ZVEeUnHz6xHGZs5Byr4zrTCFBeDyyvWUR2mv9U=' 
  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"
    }
  }
}