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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9d73cd9387d2b63e0bc3f5e75e586b91b248082d2c53a99ba54a6f4290dcd6' 
  AND token = '4ZQfhAdle0kRAM60i5sfL6dwJur6IEJIMbfxAqpbMVg=' 
  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"
    }
  }
}