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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45e4fe712f1b2352adbac958c4be60cb31268c231950d93d9bb0e424ef56209' 
  AND token = '0XXqU0DdHCLBehbQIysd4PBt2tzQzY+DLv4Kt5Q2aXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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