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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ee4d3f24efff264c3403b39a8a6617404eaad7a8b94ca1d283bc0a5b8ac543' 
  AND token = 'QwXkwrqP67OY+8vDUW0vaeh+gWZXQ7OvZeLq556mgYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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