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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8b99f5f300fd35ba881a515dca5b4ff3eed23f5a12a9fa93532a345d18bbac' 
  AND token = 'xS6Rbp7+3ZcmMAa8sCXediWwqsFWfUjUeIsvrMujm+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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