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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793d452b98e6e49ebfc77d4c0c71cf400a96bd2b2aaf60c4272e0b236d6ffa09' 
  AND token = 'ztBR5csYJbtVYlRnpveWwBUt5CtIJ3zOmXN48UkHwbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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