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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e34a6dcc100763202d28715d94bcb663002e859fb77f7a5f7875470646474f' 
  AND token = 'ldxTNps44PCGejvufQyo3zvEVr3H2H9+2wWShiAsrUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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