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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7806e881a68566bbb6c3719f94b0a653f403a8dba89744cb365258d604d7cafa' 
  AND token = 's9AjBHK9upmwnPRyTlmnrowmkQF4nCSktrLZ0t2t+Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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