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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb1d55df397362cfd9f5f3174ddf3ed87268840005710a9eb344eb3d581738f' 
  AND token = 'dlBso9yih7Wz2s7YfNUBg+BnS7M8pT1dbj+kjxagg7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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