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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5489903213ea8eb94951b6cca9aefcc2d92cb5422fa594f3961ba410c87348' 
  AND token = 'iDI+EqK68/G01AkMxL3y6V31jO/BzPCw0IzxGjKD9yA=' 
  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"
    }
  }
}