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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc6058522168cef6b79aa2b44a8fcc0391217d3df98a5de7271c8be1e03e50d' 
  AND token = 'UQF88vtkeCk2yCns2jR65TJURZmNMAD1AAT876W+RVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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