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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2b7be522db5129a60ab758377d02b79faa37dc00daea74a2311524b799fc89' 
  AND token = 'qePBfZbhCKuMQU1TNHRUcvSnn+LlORwTI//PCY4t+50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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