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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f490ad31710f93acd09c8995d91edfbb7338a5ff51df2f5f5ee36d185e4e5309' 
  AND token = 'Kqut0bZWOBF9k/iMHfJoEnNJ/GK1Y+JiUTcXRVhvoNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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