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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19e9472d5a3aabe727c7f09df75e0eb9c1a60863a15aa7205d7b06617efab9b' 
  AND token = 'k7V+vnBPv5z55pguoygQVUzfuMBFMoYdEcgWTNyc05A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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