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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27db0881c21f238101a89bc675b57f0d47a5c1d4ed0306dfab6c5246d98fad94' 
  AND token = '6K5rH84xOxLRk4nz9rRJaomRrmgd/LXgfbHSunfE+gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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