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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ac15f914fd6330348b41f8eed48011f3997903969cf52c486d493005e3aa22' 
  AND token = 'e1c3A2eal7YiVDzQz48IT7ccrstapgGB1UWzJdG2Bgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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