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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92145db2ca1ade7b8a9ad56b4217367c806fd2bf4023ff4bffbad934babf0dda' 
  AND token = 'irKlanlwL3PU1X2y79teUCy1OIB4vpXrbrdlimK8/aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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