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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b657ee851b2db95d3bea6252d4ee885a6d8d0ef23cf5f5450f16bb4fc6f18ee6' 
  AND token = 'j2a11QHRZSlLN+ElrHlW6KoDA6hwdCfKrJUNu5uAi+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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