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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bc774751dff8e8ea4b6608e958784e6e84672f8d179cf8d2b1b4d0218c242e' 
  AND token = 'ZqcQ5dgwelub3tVIjuUbFq7/lzaTNQZglcqrczimLbk=' 
  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"
    }
  }
}