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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad745cf20e1da551b2fe323873e2597915c9d5c615296e71f0e302506cc41a16' 
  AND token = 'CD6d/eEmk2lsqBWxYx7sFczUU9+N/Qa6Gk73Tqxkre8=' 
  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"
    }
  }
}