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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c01c87752ed08da4774e88c7658fa688fbcaf0361a3d0b66e0c6ce6a857afef' 
  AND token = 'lsIVVvWCB0C/DwG4LpXKCaoqef2U8CbWfyVKNS4sXKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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