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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f824eea74264793d28077d1c60fcba844286cb9a1bd13a1a9e72c069fb8ba3a2' 
  AND token = 'gPp3WxbONVLluSQC91QPgb/b2Fzf1bxAagx8t66lTeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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