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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495f7facce72b6c6a8950a07e80c5adcd91f16c297b0e0f854d93e2437574508' 
  AND token = 'AhOgnP24ULdPQ9San+71nXHaPDv/gSZZmDWU/C0dwg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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