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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9bf977fa66796242afe60af279e5a6ae2255bf113644c86d327cf0235cab12' 
  AND token = 'dM6OJOePghUv104xUa0NQaqcNXFtp2SykDc23Hc7iaE=' 
  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"
    }
  }
}