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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5d296b1de0d0322816e5aca300897be1a3fc3fa1f0bdc31626e0e112d7f83a' 
  AND token = 'Hs77W8jmLElM4DbjRqiW52ojh5QJIQ4marsXRGrHQzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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