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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e086cc9d130b6747ca0cd89a4c94ee2d29422a32b7bab3528e47c496de479fe4' 
  AND token = 'uD+SQCVDnT5jIKvkmUJ7IsSK2tXjaS/Mo96uXh3/yEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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