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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e3e3d2dd17f1086c9f57d8da5262cadfd864ec0f5901fe1f03aa075f721f88' 
  AND token = 'hleU49U4oDvz6OuIGxWoM8xS/d/A5cuPJJiOY64Rs5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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