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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db55ebefc28c11b6e23cb4613a77cd057f5a8f6a81d3dea53258cb5a650402de' 
  AND token = 'cy/bT5c7zK6qqqUm9GzlEu822YiF3EcERyaoWn+wTgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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