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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f01f2da6c83708ed19cad9b7974e19710d058716d31807bd7cc2c6edf59d06' 
  AND token = 'uhJ10l50ztExDJTOJOfqPimmjthL1GM5QEkf0aZotcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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