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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed183eb593b8ebd1842f719725f3eb04717bb106058302ef815d8423ff87b6d' 
  AND token = 'iIrU+ARRQt6I6nGSQ34/j9bPhaQN9PhKh4k8xWoPweM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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