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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ea2d946733af4a985ba34b2f88de9879c2dc95a270aa9c0d1301ef135931da' 
  AND token = 'K9063Gm4uGkZITZVJ0Hb3pbT8l4hf+SL4EMhDUDcZdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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