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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82b11481e56f6fc197038de8e9b17e90a6f239806da512a1a01b9c6f11c9ae7' 
  AND token = 'NZQb98xs6RK8PfggW3mIEMFygkTfMGAt5EaO5rc+WT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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