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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad5ee472bb544deefc8611768b91482e8f47e13670f84326d555af1464558bf' 
  AND token = 'teMlL9R6PdPOZq73MXRJrS+AGBw0Vu19s19C85SzUok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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