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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba1875a86796e97c61e801256b73df95e9fd3b8b506a186bb40aa6578b7d806' 
  AND token = '8+B08dWqEqKEkU1FfoD31+8uEuXp4WWpB2SnXKXh15s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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