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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4067606109d74120fe714cb29c51ee268e16ff3fd78d000bfcd5c957b7f3cdc6' 
  AND token = '92AnnFXSEO3gE+GftIhX30eUPBzHGFhO9cOmFAjEG/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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