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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c8ce62eca819383fcc012aea393a60d66df612d17b2af93a13540cb42e0b93' 
  AND token = 'XBW9yHy5KehoEi08bCDTwgXrZz4z/9N/zlSWQeuLPM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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