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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6243a7e7761f67f734572737ff31c1d642fc49e80b2954e1e515c9fef117dc02' 
  AND token = 'iSvgD9NRI4wIzW3q9UlGKzoN4UhTimCVtIQRbPtoE98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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