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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1aa56b9f5d24c72b940ce29224349a15c71233cd0d168522d356bdb330eaae' 
  AND token = '9okgcbzm0FcCKZkiiJS4U7xCLnHhCyR4AZ2ek5HEryE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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