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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc521f687b5864106767da22ef1aba1bb6dd3f7ae77d21c2f50ed8e87aaeb7b' 
  AND token = 'hDPrzpeSCa5cA+YTs52Cw04ZPd1Tv22S7xHRn7x8J0Y=' 
  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"
    }
  }
}