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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ca5e5315e472793107a44722c16dacd76a6ddb9d2ac9ad43c6917dbb1ea196' 
  AND token = 'Mu2t3VxToAPxZrg8hWAcp12DRRGYYyN7xOpYtaUP/wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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