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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34019a85e783933697e15f1b0741c6cb35411820940162fb3eaebbfedcac7157' 
  AND token = 'VZcKdViFF5of8zgUZkDpa3hYVX0MaibhOxn8DriUmn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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