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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ccaefbe1e41cb58ca62dd27e4d5ca250575388da8564333c09eb6de6cec250f' 
  AND token = 'ApRO3s1YGKNxOVttYbahK+A+ezGwW9jZ80kXttc9ZF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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