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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a655b1793c6d04042f3784ad29de0ca88f77c01f566a4d045bb2e962c37c920' 
  AND token = 'KXcn9F+RdsSYdQ+fJMuorzyLeD42x4/D+chbU3s7ICU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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